std::recursive_mutex::lock
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<metanoindex/>
<tbody> </tbody> void lock(); |
(seit C++11) | |
Sperrt den Mutex. Wenn ein anderer Thread bereits den Mutex gesperrt hat, wird die Ausführung des Threads solange blockiert, bis der Mutex gesperrt werden kann.
A thread may call lock on a recursive mutex repeatedly. Ownership will only be released after the thread makes a matching number of calls to unlock.
The maximum number of levels of ownership is unspecified. An exception of type std::system_error will be thrown if this number is exceeded.
Parameter
(None)
Original:
(none)
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Rückgabewert
(None)
Original:
(none)
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Ausnahmen
Wirft std::system_error, wenn Fehler auftreten, einschließlich Fehler aus dem zugrunde liegenden Betriebssystem,
lock der Erfüllung ihrer Vorgaben verhindern würde .Original:
Throws std::system_error when errors occur, including errors from the underlying operating system that would prevent
lock from meeting its specifications.The text has been machine-translated via Google Translate.
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Beispiel
Dieses Beispiel zeigt, wie
lock und unlock verwendet werden, um gemeinsam genutzte Daten zu schützen .
Original:
This example shows how
lock and unlock can be used to protect shared data.
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#include <iostream>
#include <chrono>
#include <thread>
#include <mutex>
int g_num = 0; // protected by g_num_mutex
std::mutex g_num_mutex;
void slow_increment(int id)
{
for (int i = 0; i < 3; ++i) {
g_num_mutex.lock();
++g_num;
std::cout << id << " => " << g_num << '\n';
g_num_mutex.unlock();
std::this_thread::sleep_for(std::chrono::seconds(1));
}
}
int main()
{
std::thread t1(slow_increment, 0);
std::thread t2(slow_increment, 1);
t1.join();
t2.join();
}
Possible output:
0 => 1
1 => 2
0 => 3
1 => 4
0 => 5
1 => 6